Dey K, Shahriar S, Anan M A R, Malakar P, Rahman M M, Chowdhury M M
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh
Department of Mechanical Engineering, The University of New Mexico Albuquerque NM 87131 USA.
RSC Adv. 2024 Aug 5;14(34):24483-24491. doi: 10.1039/d4ra04814h.
In recent years, the 'kirigami' technique has gained significant attention for creating meta-structures and meta-materials with exceptional characteristics, such as unprecedented stretchability. These properties, not typically inherent in the original materials or structures, present new opportunities for applications in stretchable and wearable electronics. However, despite its scientific and practical significance, the application of kirigami patterning on a monolayer of tungsten disulfide (WS), an emerging two-dimensional (2D) material with exceptional mechanical, electronic, and optical properties, has remained unexplored. This study utilizes molecular dynamics (MD) simulations to investigate the mechanical properties of monolayer WS with rectangular kirigami cuts. We find that, under tensile loading, the WS based kirigami structure exhibits a notable increase in tensile strain and a decrease in tensile strength, thus demonstrating the effectiveness of the kirigami cutting technique in enhancing the stretchability of monolayer WS. Additionally, increasing the overlap ratio enhances the stretchability of the structure, allowing for tailored high strength or high strain requirements. Furthermore, our observations reveal that increasing the density of cuts and reducing the length-to-width ratio of the kirigami nanosheet further improve the fracture strain, thereby enhancing the overall stretchability of the proposed kirigami patterned structure of WS.
近年来，“折纸剪裁”技术因能制造出具有诸如前所未有的拉伸性等非凡特性的超结构和超材料而备受关注。这些特性并非原始材料或结构所固有，为可拉伸和可穿戴电子产品的应用带来了新机遇。然而，尽管其具有科学和实际意义，但在单层二硫化钨（WS）这种具有卓越机械、电子和光学特性的新兴二维（2D）材料上应用折纸剪裁图案仍未得到探索。本研究利用分子动力学（MD）模拟来研究具有矩形折纸剪裁的单层WS的机械性能。我们发现，在拉伸载荷下，基于WS的折纸结构的拉伸应变显著增加，拉伸强度降低，从而证明了折纸剪裁技术在提高单层WS拉伸性方面的有效性。此外，增加重叠率可提高结构的拉伸性，从而满足定制的高强度或高应变要求。此外，我们的观察结果表明，增加剪裁密度并减小折纸纳米片的长宽比可进一步提高断裂应变，从而增强所提出的WS折纸图案结构的整体拉伸性。
